feat(touch events): add support for touch events

This pull request add support for touch events. The changes are only in the JavaScript file... sorry, I don´t know LiveScript (yet).

Tested on Chrome with touch simulation, IE 10 and Firefox. On iPad 2 the drag isn´t as soft as should be but I think it can be debug.

I´d like that you test this changes too.

Thanks.

Bye.